A property for a dental clinic: zoning, X-ray room shielding and the opening notification

The key point: For a dental clinic, you rarely need to worry about zoning. A clinic without beds can be built in every zone under Building Standards Act Appended Table 2. What trips you up is: (1) the X-ray room's protective structure (画壁 shielding); (2) whether a change-of-use confirmation is required, which turns on beds vs. no beds; (3) water supply/drainage, electrical capacity and chair-unit piping; and (4) barrier-free rules. On procedure, a dentist opening a bedless dental clinic themselves needs only the Medical Care Act art. 8 opening notification (within 10 days of opening); a medical corporation, or a clinic with beds, needs the art. 7 opening permit first; and once you install an X-ray apparatus a separate notification is required within 10 days (Medical Care Act art. 15(3); Enforcement Regulation art. 24-2). What a real-estate company (we) handle is the property-suitability survey—zoning, frontage road, floor area, the condition of any existing building, water and electrical capacity—and brokerage including the important-matters explanation (Real Estate Brokerage Act art. 35). Preparing the opening notification and the X-ray installation notification is an administrative scrivener's work; the shielding design and building confirmation an architect's and a designated confirmation body's; the building registration a judicial scrivener's; staff social insurance and labour a certified social insurance labour consultant's; fees and tax a tax accountant's—each an independent business contracted with separately (no referral fees are exchanged). The final judgment on whether the clinic may open rests with the public health centre and the dentist.

For dentists weighing a branch or independent opening, and for real-estate staff handling dental properties, this article organises what you can confirm before viewing and signing, in the order of the law and municipal guidance. This is general information; the final judgment on whether a particular property meets the Medical Care Act / Building Standards Act rests with the competent public health centre / building authority and the respective licensed professionals.

Yotsuba Real Estate Co., Ltd. (四葉不動産株式会社), based in Bunkyo, Tokyo, provides surveys and brokerage of commercial real estate. You can consult us from the stage of "can I open a dental clinic in this property".

What kind of property lets you open a dental clinic?

Start with zoning. The conclusion is that a dental clinic, as a bedless clinic, can be built in every zone under Building Standards Act Appended Table 2. A hospital is restricted in the Category-1/Category-2 low-rise exclusive residential zones, the agricultural-residential zone, the exclusive industrial zone and so on, but a clinic faces no such restriction. In other words, a property where "zoning forbids a dental clinic" is, in principle, almost non-existent.

What trips you up is the building-side conditions. The four to look at before signing:

Check item	Why it matters	How to check
X-ray room shielding	A room for dental/panoramic/CT units needs 画壁 shielding (Enforcement Regulation art. 30-4)	Any existing shielding, dose measurement outside the 画壁, the apparatus you will install
Change-of-use confirmation	Bedless = not a special building, so in principle unnecessary; beds / large scale may require it	Presence of beds, floor area of the changed part; inquire with the building authority
Water / electrical capacity	Units, suction, sterilisers and CT use a lot of water and power	Diameter/position of existing piping, contract power, capacity of the distribution board
Barrier-free	A property at or above a set scale, or under a barrier-free ordinance, must meet the standard	Floor area; the barrier-free ordinance's threshold in the municipality

Of these, the one specific to dentistry and costly to overlook is the X-ray room shielding. We take it in turn.

What standards govern the X-ray room's protective structure?

A dental clinic almost always installs a dental X-ray, a panoramic unit, or a dental CT. A room where such diagnostic X-ray apparatus is used in a fixed position (an X-ray room) must meet the Enforcement Regulation's structural standards.

At the centre of the shielding is Enforcement Regulation art. 30-4(1). The X-ray room's 画壁 (walls, floor, ceiling, doors) must be shielded so that the effective dose outside them stays at or below the regulatory standard, and the measurement is taken outside the 画壁 under normal use. In other words, the test is not "how much lead or concrete you wrapped around it" but "is the dose measured outside the 画壁 at or below the standard." The specific numeric standard and measurement details are fixed in the regulation text and the Ministry of Health, Labour and Welfare's notices, so decide the apparatus (dental or CT) and the room size, then apply the latest provision and confirm with the competent public health centre.

Point to confirm	Content	Who
画壁 shielding	Do walls/floor/ceiling/doors hold the outside effective dose at or below the standard (art. 30-4(1))?	Architect / shielding-design contractor
Dose measurement	Measure the dose outside the 画壁 and attach the result to the installation notification	Measurement contractor
Difference by apparatus	A dental CT is higher-output than a dental unit and tends to need thicker shielding	Apparatus maker / architect

At the property stage, what we can back up is the objective condition—the size of the area usable as an X-ray room, its position relative to adjoining rooms, floors above/below and the exterior, the structure of existing walls. Fitting that into the shielding design/calculation belongs to the architect and the shielding-design contractor; if the work needs a building confirmation, a designated confirmation body reviews it.

When, and to whom, are the opening notification and the X-ray installation notification submitted?

The procedure splits at the entrance by who opens the clinic and whether there are beds.

Scene	Basis	Procedure	Deadline
A dentist opens a bedless clinic themselves	Medical Care Act art. 8	Clinic opening notification (prefectural governor = in practice the public health centre)	Within 10 days of opening
A medical corporation opens / there are beds	Medical Care Act art. 7	Clinic opening permit (permit in advance)	Obtain the permit before opening
An X-ray apparatus is installed	Medical Care Act art. 15(3); Enforcement Regulation art. 24-2	X-ray installation notification (prefectural governor = in practice the public health centre)	Within 10 days of installation

What to grasp here is that the most common case—a dentist opening their own bedless clinic—is satisfied by a notification, whereas making a medical corporation the opener or providing beds requires a permit in advance. Because a permit is before opening and a notification is within 10 days after, settling the form of opening before you secure a property reduces rework.

Separately from the clinic notification/permit, once an X-ray apparatus is installed, an installation notification is required within 10 days. A mobile or portable apparatus is notified the same way. Preparing these notifications and permit applications is an administrative scrivener's field; we handle the property survey and brokerage and connect you to an administrative scrivener (an independent business under a separate contract). The final judgment on whether the clinic may open rests with the public health centre and the dentist.

What should you check when using a former dental fit-out property?

A former-dental fit-out property, with units, piping and an X-ray room still in place, looks attractive. But "the previous dentist could use it" does not mean "your opening can use it." Points to check:

• The previous opener's notifications do not carry over. Both the clinic opening notification and the X-ray installation notification are per-opener, so you re-file.
• Does the old X-ray room's shielding fit the current standard and your apparatus? Shielding for a dental unit may fall short for a panoramic or dental CT. Re-measure the dose outside the 画壁 and re-evaluate.
• Position and diameter of water/unit piping. Changing the layout may require re-running the piping.
• Electrical capacity. Check whether the contract power suffices for added CT or sterilisers, and the capacity of the distribution board.

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Of this, the objective condition (area, piping, electrical capacity, existing equipment) is ours to confirm; whether the shielding meets the standard, and any refurbishment design, belongs to the architect and the shielding-design contractor. For finding commercial property see the consultation desk for commercial / investment real estate; for a base/office property see the consultation desk for business bases and office property. On zoning and floor area, as a commercial property, the article on a care-business property and zoning is also a useful reference.

What to watch for on water, electrical capacity and unit expansion?

A dental clinic depends on infrastructure more than its visible layout. Each unit gathers water, drainage, suction, air and power, and adding a CT and sterilisers raises the electrical and water load further.

Equipment	What to check on the property
Water / drainage	Diameter/position of existing piping, feasibility of re-running when adding units, drainage slope
Electrical capacity	Contract power, spare circuits on the board, whether CT/steriliser/compressor can run simultaneously
Air-conditioning / ventilation	Ventilation for areas handling dental technical work or chemicals; compressor noise/location
Barrier-free	Entrance steps/corridor width; whether it falls under the municipality's barrier-free ordinance threshold

On barrier-free: under the national law (the Act on Promotion of Smooth Movement of Elderly Persons, Disabled Persons, etc.), new construction at or above a set floor area must meet the standard, and many dental clinics fall below that, while a municipal ordinance may lower the threshold. Confirming the municipality's ordinance at the property-selection stage saves panic at the interior-design stage.

The property-side infrastructure condition is ours to confirm; equipment design, shielding design and building confirmation go to the architect and specialists; the opening/installation notifications to an administrative scrivener; staff social insurance and labour to a certified social insurance labour consultant; the building registration to a judicial scrivener; fees and tax to a tax accountant. These cannot be bundled into one contract; each is an independent business contracted with separately. The property is ours, the application the administrative scrivener's, the design the architect's—with the windows separated, connected smoothly from one and the same window. No referral fees are exchanged.

Bring your dental-clinic property search to Yotsuba Real Estate—initial consultation is free

In your message, write "dental clinic," the desired area, the apparatus (dental / panoramic / dental CT), the expected number of units, with or without beds, and the opener (individual or medical corporation). We talk through everything from confirming zoning, floor area, water and electrical capacity and the area usable as an X-ray room to organising who to refer the opening and installation notifications to.

Frequently asked questions

Q. Are there properties where a dental clinic cannot open due to zoning?
A. In principle, almost none. A dental clinic, as a bedless clinic, can be built in every zone under Building Standards Act Appended Table 2. A hospital is restricted in low-rise exclusive residential zones, exclusive industrial zones and so on, but a clinic is not. What trips you up is not zoning but building-side conditions: the X-ray room shielding, whether a change-of-use confirmation is needed (beds vs. no beds), water/electrical capacity, and barrier-free rules.

Q. How should the X-ray room be built?
A. A room where dental X-ray apparatus is used in a fixed position (an X-ray room) must shield its 画壁 (walls/floor/ceiling/doors) so that the effective dose outside them is at or below the regulatory standard (Enforcement Regulation art. 30-4(1)). The test is not "how much you wrapped around it" but "is the dose measured outside the 画壁 at or below the standard," measured outside the 画壁 under normal use. Because the specific numeric standard is fixed in the regulation text and MHLW notices, decide the apparatus and room size, then apply the latest provision and confirm with the public health centre. The shielding design/calculation belongs to the architect and specialists.

Q. When are the clinic opening notification and the X-ray installation notification submitted?
A. When a dentist opens a bedless clinic themselves, Medical Care Act art. 8 requires a clinic opening notification to the prefectural governor (in practice the public health centre) within 10 days of opening. A medical corporation, or a clinic with beds, needs an opening permit in advance under art. 7, reversing the order. Once an X-ray apparatus is installed, a separate installation notification is required within 10 days under art. 15(3) and Enforcement Regulation art. 24-2. Preparing the notifications and applications is an administrative scrivener's field.

Q. If it was a former dental fit-out, can I use it as is?
A. "The previous dentist could use it" does not mean "your opening can use it as is." Both the clinic opening and X-ray installation notifications are per-opener, so you re-file; whether the old X-ray room's shielding fits the current standard and your new apparatus (e.g. switching from a dental unit to CT) must be re-evaluated by re-measuring the dose outside the 画壁. Water/unit piping position and electrical capacity may also need re-running with a layout change. The condition check is ours; the shielding evaluation and refurbishment design belong to the architect and specialists.

Sources

The following public materials are starting points. Laws are amended, so check the current article, paragraph, item, enforcement date and latest amendment on e-Gov Law Search. Municipal barrier-free ordinances and the clinic-opening / X-ray-installation guidance change from time to time, so check the latest guidance of the municipality / public health centre concerned. Whether a particular property meets each standard is judged by the competent public health centre / building authority and the respective licensed professionals. Public materials were all consulted on 5 November 2026. The sources below are in Japanese.

• e-Gov Law Search: Medical Care Act (Act No. 205 of 1948; art. 7 = opening permit, art. 8 = clinic opening notification within 10 days, art. 15(3) = basis for the diagnostic-radiation notification)
• e-Gov Law Search: Enforcement Regulation of the Medical Care Act (MHW Ordinance No. 50 of 1948; art. 24-2 = X-ray installation notification within 10 days, art. 30-4(1) = 画壁 shielding standard for the X-ray room; confirm the specific numbers in the regulation text and MHLW notices)
• e-Gov Law Search: Building Standards Act (Act No. 201 of 1950; Appended Table 2 = building restrictions within zones, where a clinic may be built in every zone; Appended Table 1 = special buildings, which include a clinic with patient-accommodation facilities; art. 87 = application to change of use)
• e-Gov Law Search: Act on Promotion of Smooth Movement of Elderly Persons, Disabled Persons, etc. (Act No. 91 of 2006; barrier-free compliance for special specified buildings; check any lowered threshold in the municipal ordinance)
• e-Gov Law Search: Real Estate Brokerage Act (Act No. 176 of 1952; art. 35 = explanation of important matters)
• Each public health centre's "guide to opening a clinic" and "X-ray installation notification" (confirm with the municipality concerned; consulted 5 November 2026)

This article provides general information and does not guarantee that a particular property meets the Medical Care Act / Building Standards Act / barrier-free law. The property-suitability survey and brokerage are real estate's (ours); the opening/installation notifications an administrative scrivener's; the shielding design and building confirmation an architect's and a designated confirmation body's; the building registration a judicial scrivener's; staff social insurance and labour a certified social insurance labour consultant's; fees and tax a tax accountant's—each judged and handled by them.

Joji Uramatsu (浦松 丈二), Representative Director and licensed real estate transaction specialist, Yotsuba Real Estate Co., Ltd. (四葉不動産株式会社). As a licensed real estate transaction specialist in Bunkyo, Tokyo, we provide surveys and brokerage of commercial real estate. Author profile

Updated: 5 November 2026